<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>跨域测试</title>
    <!--通过 cdn 形式引入 axios  异步请求库  -->
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script>

        //1.发送异步请求
        axios.get("http://127.0.0.1:8080/demo");

    </script>
</head>
<body>
<h1>用来测试跨域</h1>
</body>
</html>